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Oxygen feeding refining method for molten iron and top-blow lance

A technology for sending oxygen and molten iron, applied in the manufacture of converters, etc., can solve problems such as inability to increase the flow rate, and achieve the effect of a large variable range

Pending Publication Date: 2020-07-31
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In addition, in the method of Patent Document 2, the purpose is to separate the boundary layer of the gas flow from the wall surface of the nozzle at the enlarged tip of the Laval nozzle, and to alleviate the state of excessive expansion at low gas flow rates, but there is the following problem: when the gas supply pressure is higher than The flow rate cannot be effectively increased under the insufficient expansion condition of the appropriate expansion pressure determined by the opening ratio of the nozzle

Method used

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  • Oxygen feeding refining method for molten iron and top-blow lance
  • Oxygen feeding refining method for molten iron and top-blow lance
  • Oxygen feeding refining method for molten iron and top-blow lance

Examples

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Embodiment

[0115] Hereinafter, an actual example in which the oxygen-feeding refining method for molten iron of the present invention is applied to an industrial-scale converter decarburization treatment will be described.

[0116] In a 300t-scale top-bottom blowing converter facility, the decarburization treatment of molten iron was performed by changing the spray nozzle styles of various top-blowing lances, and the effects on the amount of dust generation, iron yield, and slag generation status were investigated. After the molten iron is received in the blast furnace and transported to the ironworks in the iron mixing car containing the iron scraps containing the weight scraps in advance, a predetermined amount of the molten iron is poured into the molten iron ladle, and a mechanical stirring type molten iron desulfurization device is used in the molten iron ladle. Carry out desulfurization treatment. After the desulfurized slag was discharged from the ladle, molten iron was charged in...

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Abstract

The invention discloses an oxygen feeding refining method for molten iron. At least a portion of the oxygen feed refining, provided is an oxygen-containing gas injection nozzle that passes through thehousing of a top-blowing lance, a control gas is discharged from the discharge port (3) toward the inside of the spray nozzle; an oxygen-containing gas, which is a main supply gas, is supplied from the inlet side of an injection nozzle and injected from the injection nozzle. The discharge port (3) is provided on the nozzle side surface of a region (1) where the cross-sectional area of the nozzleis the smallest in the axial direction of the nozzle or a region near the region, and is disposed such that at least a part of the discharge port exists in both spaces when the discharge port is divided into two parts by any plane passing through the central axis of the nozzle.

Description

technical field [0001] The present invention relates to an oxygen-supplied refining method of molten iron for performing oxygen-transport refining by blowing an oxygen-containing gas from a top-blowing lance to molten iron charged in a reaction vessel, and a top-blowing lance used for the oxygen-transmitting refining. Background technique [0002] In the oxidative refining of molten iron, from the viewpoint of improving the reaction efficiency, a practical oxygen supply method capable of simultaneously controlling the jet flow rate and the gas flow rate of the oxygen-containing gas injected from the top blowing lance on the molten iron bath surface has been sought. [0003] For example, in the decarburization refining of molten iron using a converter, from the viewpoint of improving the productivity of the converter, an operation to increase the flow rate of top blowing oxygen per unit time may be performed. However, in this case, if the flow velocity of the jet flow on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/32C21C5/46
CPCC21C5/32C21C5/4606
Inventor 小田信彦奥山悟郎天野胜太中濑宪治高桥幸雄日野雄太菊池直树三木祐司
Owner JFE STEEL CORP
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